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4(2z-6)=80
We move all terms to the left:
4(2z-6)-(80)=0
We multiply parentheses
8z-24-80=0
We add all the numbers together, and all the variables
8z-104=0
We move all terms containing z to the left, all other terms to the right
8z=104
z=104/8
z=13
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